Ununseptium: 294
Unnilseptium used to refer to the hypothetical element with atomic number 170. However, it is not an officially recognized element and is not found on the periodic table.
The symbol for Unnilennium is Une. Group Transition Metal, atomic number 109, atomic weight (266). A man-made radioactive transition metal. Discovered by: Heavy Ion Research Laboratory.Year: 1982 Location: Germany.
Bohrium, previously known as unnilseptium (Uns), with the chemical symbol Bh, has the atomic number 107.
Atomic no.=no. of protons Atomic mass=no. of protons+no. of neutrons Hence, atomic mass is greater
The atomic mass is the mass of a molecule, atomic particle or sub-atomic particle.
Atomic mass
The atomic mass (or weight) of silver is 107.8682 amu (atomic mass units)
The atomic mass number of aluminum is 27. The atomic mass of aluminum is 26.98115386
Cobalt has an atomic mass of 58.933195(5) while nickel has an atomic mass of 58.6934(4). Nickel has the lower atomic mass.
The atomic mass of arsenic is approximately 74.92 atomic mass units.
The atomic mass of potassium is approximately 39.10 atomic mass units.
== == Atomic Mass: 54.93805 amu